Having established that full spark ensembles of size \(N\ge M+1\)  yield almost injective intensity measurements, we note that checking whether a matrix is full spark is \(\) -hard in general [1]}.
Granted, there are a few explicit constructions of full spark ensembles which can be used [2]}, [3]}, but it would be nice to have a condition which is not computationally difficult to test in general.
We provide one such condition in the following theorem, but first, we briefly review the requisite frame theory.
